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Aphonopelma moderatum

🔤 Taxonomy

Aphonopelma moderatum is the currently accepted scientific name. The accepted name is Aphonopelma moderatum. As with many Aphonopelma, older records and trade labels may be imprecise, so locality data is useful when possible.

English common names used in the hobby:

  • Rio Grande gold tarantula
  • Texas gold tarantula

📌 Description

Aphonopelma moderatum is a terrestrial North American tarantula valued for warm brown and golden tones. It is usually manageable, but its slower growth and limited availability make careful sourcing important.

Adults are usually around 11-14 cm legspan. Females usually become heavier and live far longer than mature males.

This species is usually kept for its warm gold-brown color and steady terrestrial habits, but it should not be rushed. Slings can grow slowly, adults may fast, and newly acquired animals need time to settle into a hide before they feed reliably. Treat apparent inactivity as normal unless it is paired with dehydration, injury, or a failing body condition.

☠️ Venom

The bite risk is low when the spider is left alone, but it can still bite if restrained. Urticating hairs and fall injuries are more realistic routine risks.

🌍 Distribution

Aphonopelma moderatum is associated with south-central North America, especially Texas and nearby semi-arid grassland or scrub habitats. In care, think low enclosure, dry upper substrate, deeper retreat moisture, and very secure ventilation.

The Rio Grande and south Texas context points to heat tolerance, seasonal dryness, and secure retreats, not to a bare desert box. Keep the surface mostly dry, but allow a slightly moister layer under the hide or at one side so the spider can choose where to sit.

Range map

⚖️ Legal status

As checked against current official CITES Appendices and EU wildlife-trade Annex references on 2026-06-01, no current CITES listing or specific EU Annex listing was found for Aphonopelma moderatum. The species is not relevant to the Bern Convention because it is not native to Europe.

In the United States, state, park, landowner, and collecting rules can matter even when the species is not currently listed under CITES. Local and national rules on collection, import, sale, transport, exhibition, breeding, and proof of legal origin may still apply. Captive-bred animals from traceable sources are strongly preferred.

Collection rules can be more important than the absence of a CITES listing. Ask for captive-bred status, locality where known, and proof that the seller obtained the animal legally. This is especially useful for Aphonopelma because old regional names and similar brown species are easily confused.

🤌 Husbandry

Aphonopelma moderatum should be housed alone. It is not a communal tarantula.

Use smaller secure containers for spiderlings and juveniles, then upgrade gradually. For an adult, a practical enclosure is about 30 x 30 x 30 cm, adjusted around the animal’s build and behavior.

Useful care priorities:

  • Low enclosure with more floor than height
  • Deep shape-holding substrate
  • Stable hide
  • Fresh water dish
  • Dry surface with a slightly moister retreat zone

Start spiderlings in small, low containers with enough substrate to make a starter burrow. A small sling kept in a large adult box can miss prey, dry unevenly, or disappear where the keeper cannot check hydration. Increase enclosure size in stages after molts, keeping the fall distance low at every stage.

Adults should have more floor area than height, a firm hide, and enough substrate to dig or block the entrance. Aphonopelma species often benefit from calm routines. Do not keep moving the hide because the spider closed it, and do not mistake a long fast for a demand for more humidity. Check body condition, water access, and temperature first.

New arrivals should be quarantined and left mostly undisturbed until they use the hide and take prey reliably. Wild-origin or recently collected animals may arrive thin, stressed, or carrying mites. A simple enclosure with clean water and stable temperatures is safer than a planted display during the settling period.

💡 Lighting

No specialist lighting or UVB is required. A normal room day-night rhythm is enough; any plant light should not overheat or dry the enclosure.

🌡 Heating and temperature

A practical daytime range is about 20-26°C, with a night drop around 16-21°C. Avoid hot lamps aimed at a small enclosure; warming the room is usually safer than creating a dry hot spot.

These spiders tolerate normal household variation better than many tropical species, but they still need stability. Cool nights are acceptable; cold, damp, and unfed is not. A mild winter slowdown can be allowed for healthy adults if the room naturally cools, but avoid forced brumation for small juveniles or animals that arrived recently.

💧 Humidity and water

Aim for about 45-65% with fresh water always available. The goal is usable microclimates: not bone dry, not wet throughout, and never stale.

For Aphonopelma, a water dish and a dry surface are more important than chasing a high humidity number. Overflow the dish or dampen one corner occasionally if the room is very dry. The spider should be able to choose between a dry entrance and a slightly moister lower area. Constantly wet substrate often causes more problems than a moderate dry cycle.

🌿 Enclosure and decoration

Use substrate that holds shape, stable cork or hide pieces, and enough cover for the spider to retreat completely. Avoid mesh surfaces that can catch claws, unstable hard decor, and excessive height for terrestrial or fossorial species.

The best enclosure is plain and low. Use compacted coco fiber, unfertilized soil, clay-soil mix, or another tarantula-safe substrate that keeps a burrow entrance from collapsing. Adults often use 10-15 cm of substrate if it is offered, especially when the hide is partly buried.

Avoid tall rocks, branches, and hard ornaments. A heavy terrestrial tarantula can rupture the abdomen in a short fall. If a mesh lid is already in use, replace it or cover the dangerous interior surface so claws cannot catch during climbing.

🪳 Feeding

Feed suitable live insects such as roaches, crickets, locusts where legal, and occasional mealworms or superworms. Juveniles usually eat more often; adults commonly do well on an appropriately sized meal every 7-14 days. Remove uneaten prey promptly, especially before a molt.

Feed according to body condition rather than excitement at the tongs. A rounded but not swollen abdomen is the target. Spiderlings can take small prey more often, while adults usually do better with one suitable meal every 7-14 days and longer pauses before molts or seasonal slowdowns.

Use prey no larger than the spider can subdue safely. Roaches, crickets, and locusts where legal are useful staples; mealworms and superworms should not be left to burrow into the substrate. Remove uneaten prey within a few hours, and always remove live prey when the spider is in premolt or has just molted.

🩺 Common problems

Common problems include dehydration, stale wet substrate, overheating, falls, escape during maintenance, and difficult molts. A tarantula resting on its back is often molting and should not be disturbed.

Common mistakes are too much height, too much moisture, and too much interference. A spider that refuses food but remains heavy and sealed in a burrow may simply be in premolt. A spider with a shrinking abdomen, poor posture, or weak movement needs a water check, temperature check, and a review of recent handling or shipping stress.

Do not dig out a closed burrow unless there is a clear emergency. During molt, leave the spider untouched and remove feeders. If there is a fall injury, leaking hemolymph, severe dehydration, or a bad molt, keep handling minimal and contact an experienced exotics veterinarian where possible.

📌 Conclusion

Aphonopelma moderatum suits keepers who like slow, steady terrestrial tarantulas and who can resist unnecessary handling. Choose captive-bred or legally sourced animals and keep the setup simple, dry, and secure.

The best keeper for this species is patient. Success comes from dry safe housing, water access, low fall risk, legal sourcing, and the restraint to leave a settled spider alone.

📚 Sources and further reading